Advisories

WTPN33 PGTW 301500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL STORM 20W (BANG-LANG) WARNING NR 018//
RMKS/
1. TROPICAL STORM 20W (BANG-LANG) WARNING NR 018    
   02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   301200Z --- NEAR 34.1N 165.9E
     MOVEMENT PAST SIX HOURS - 305 DEGREES AT 14 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   BECOMING EXTRATROPICAL
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            040 NM SOUTHEAST QUADRANT
                            000 NM SOUTHWEST QUADRANT
                            000 NM NORTHWEST QUADRANT
   REPEAT POSIT: 34.1N 165.9E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   310000Z --- 36.2N 165.3E
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   BECOMING EXTRATROPICAL
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            000 NM SOUTHWEST QUADRANT
                            000 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 015 DEG/ 16 KTS
    ---
   24 HRS, VALID AT:
   311200Z --- 39.4N 166.3E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
    ---
REMARKS:
301500Z POSITION NEAR 34.6N 165.8E.
30AUG26. TROPICAL STORM 20W (BANG-LANG), LOCATED APPROXIMATELY
889 NM NORTH OF WAKE ISLAND, HAS TRACKED NORTHWESTWARD AT 14
KNOTS OVER THE PAST SIX HOURS. THE SYSTEM HAS CONTINUED TO RAPIDLY
WEAKEN AS IT INTERACTS WITH TROPICAL DEPRESSION 21W LOCATED 180 NM TO
THE SOUTH. DEEP CONVECTION PERSISTS ALONG THE NORTHERN AND EASTERN
PERIPHERY. THE SYSTEM WILL UNDERGO SUBTROPICAL TRANSITION AS IT
TRAVERSES SEA SURFACE TEMPERATURES BELOW 26 DEGREES CELSIUS,
WHILE AN UPPER-LEVEL TROUGH RESIDES OVERHEAD. AS THE PROXIMITY TO
TD 21W INCREASES, AN EXTENSIVE RIDGE CENTERED EAST OF THE DATELINE
WILL PULL THE SYSTEM NORTHWARD OVER COOLER WATERS AND INTO A MORE
BAROCLINIC ENVIRONMENT. THE FORECAST CALLS FOR SLOW WEAKENING AS
CONVECTION PERSISTS DUE TO A COLDER TROPOPAUSE AND STRONG POLEWARD
OUTFLOW ALOFT. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT 
TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED 
FOR SIGNS OF REGENERATION. MINIMUM CENTRAL PRESSURE AT 301200Z IS 993
MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 301200Z IS 12 FEET.
REFER TO TROPICAL DEPRESSION 21W (ETAU) WARNINGS (WTPN32 PGTW)
FOR SIX-HOURLY UPDATES.//
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